Ultraviolet light has the ability to scramble microbial DNA rendering 99.9% of microorganisms inert. This prevents them from reproducing and makes them effectively dead. It is important that your system allows your feedwater to have enough contact time with the bulb to ensure complete disinfection. It's also important to change your bulb regularly. Here you will find the resources necessary to perform all manner of technical support for your US Water ultraviolet disinfection. If you don't find what you need here, you can always email us at firstname.lastname@example.org or call 1-800-608-8792. We also have online-chat available from 8am to 8pm.